28521087 has 48 divisors (see below), whose sum is σ = 47721312. Its totient is φ = 15052800.

The previous prime is 28521079. The next prime is 28521107. The reversal of 28521087 is 78012582.

It is not a de Polignac number, because 28521087 - 2³ = 28521079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28521037) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 252343 + ... + 252455.

It is an arithmetic number, because the mean of its divisors is an integer number (994194).

Almost surely, 2^28521087 is an apocalyptic number.

28521087 is a deficient number, since it is larger than the sum of its proper divisors (19200225).

28521087 is a wasteful number, since it uses less digits than its factorization.

28521087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 28521087 is about 5340.5137393326. The cubic root of 28521087 is about 305.5310536729.

The spelling of 28521087 in words is "twenty-eight million, five hundred twenty-one thousand, eighty-seven".